Bulkhead confronts Dirtboss and the Constructicons.

A bioengineering genius experiments with some of Bumblebee's hydraulic fluid.

A disgruntled former employee tries to use an Autobot to destroy the city in a bid for revenge.

Sari has to defend the Autobot home base from invading Constructicons.

Bumblebee springs into action when Megatron unleashes a speed demon and sends it on a crime spree.

Bumblebee competes against the Decepticons in an underground racing competition.

The Autobots find that their new base on Earth is already inhabited.

When the AllSpark turns construction vehicles into Autobots, Bulkhead becomes fast friends. However, the Decepticons have other plans in mind.

The second-rate villains of Detroit team up to beat the Autobots.

The battle continues; Sari Sumdac discovers the Autobots and the Allspark.

The Autobots find the Allspark and the Decepticons try to seize it.

Megatron reprograms Professor Sumdac's animatronic dinosaurs, turning them into Dinobots.

When Sari mysteriously disappears, Prowl and Bulkhead go searching for her on Dinobot Island.

Prowl, Bumblebee, and Sari investigate a Cybertronian energy signal detected by Optimus Prime.

Optimus teams up with Sentinel Prime in order to defeat the Headmaster.

Starscream captures Bumblebee and a number of civilians in an attempt to obtain the Allspark.

Bulkhead is suspicious of the musical robot player Sari receives as a birthday gift.

The AllSpark creates a new Autobot out of pieces of garbage.

Soundwave action figures are sold for Christmas.

Sari hunts for a way to help the Autobots escape.

Optimus Prime and his band of Autobots are taken off the job when the Cybertron Elite Guard, led by Ultra Magnus, comes to Earth looking for the AllSpark.

Wasp travels to Earth to exact his revenge on Bumblebee.

Ratchet's old enemy, the bounty hunter Lockdown, resurfaces.

Unlikely matchups! It's Optimus Prime and Dinobot Grimlock vs. Blackarachnia and Meltdown.

Ratchet and Captain Fanzone are catapulted to Cybertron.